Interfacial integrity of bonded restorations with self-etching adhesives: Water storage and thermo-mechanical cycling

Abstract

Objectives:Objective: To evaluate the effect of thermo-mechanical cycling (TMC) on the microleakage (μL) and axial gap width (AG) of Class V bonded restorations in premolars using self-etching adhesive systems. The bond strength of composite restorations to dentin (μTBS) using the same adhesives was also evaluated in third molars after water storage: 24 h and 6 months. The research hypotheses were tested for the results of two self-etching adhesives in comparison when a conventional two-step adhesive was used: (1) the μL and AG would be lower, regardless of TMC; (2) the μTBS of self-etching adhesives would be higher, irrespective of evaluation times.Methods:Sixty Class V composite restorations were made in 30 premolars and bonded with Adper Single Bond 2 (ASB2), AdheSE (ASE), and Adper Prompt L-Pop (APL-P) (n=20). Dentin μL and AG were immediately measured for half of the sample. The other half was evaluated after TMC. Eighteen third molars were also selected and bonded using the same adhesives to test the μTBS to dentin. Specimens were evaluated after 24 h and 6 months of water storage.Results:No differences in μL and AG were found among the groups (P>.05). The μTBS mean values were: ASB2>ASE>APL-P (P<.05); only Adper Single Bond 2 presented a significantly lower μTBS after water storage (P<.05).Conclusions:The bonding approach does not influence the microleakage and interfacial gap extension. Despite the decrease in the mean values, the bond strength to dentin of the conventional, two-step adhesive remains high after 6 months of water storage.

No-waiting dentine self-etch concept—Merit or hype

“…This accounts for the increase in the propensity of silver impregnation along the interface after thermomechanical cycling (Fig. 1B) [26]; the phenomenon was more pronounced when the adhesive was applied with reduced application time.…”

“…those not related to the pilot study) were divided into two batches. One batch was stored in deionised water at 37°C for 24 h; the other batch was subjected to thermomechanical challenge, using 10,000 thermal cycles (10°C for one min, 25°C for one min and 55°C for one min) and 240,000 mechanical cycles, corresponding to one year of intraoral functioning [25,26]. The resin-dentine specimens were sectioned in both x and y directions across the adhesive interface to obtain beams with cross-sectional areas of approximately 0.9 mm × 0.9 mm using the 'non-trimming' version of the microtensile bond testing procedures [27].…”

Effects of Er, Cr: YSGG Laser on Shear Bond Strength of the Orthodontic Brackets for 5 and 10 Seconds: An In Vitro Study

“…Sixty-nine intact human premolar teeth extracted for orthodontic requirement were used in the current study. The teeth were stored in 0.1% thymol solution at room temperature until use to prevent bacterial growth [ 20 ]. The teeth were visually examined and found to be free of caries, macroscopic fractures, and wear.…”

Effect of Ultrasonic Scaling on Microleakage of Class V Composite Restorations Bonded With Different Adhesives

“…Therefore, different adhesive systems have been proposed by manufacturers, depending on different adhesion strategies. 5 Traditionally, bonding to dental tissues was obtained by etch and rinse (ER) strategy, where phosphoric acid was applied for etching, followed by rinsing and applying an adhesive agent. 6 Later on, more simple products were introduced with the development of self-etching (SE) adhesives, eliminating the need for conditioning, rinsing and drying steps that were critical for the adhesion protocol.…”

“…These stresses can affect the tooth-restoration bond. 14 Although some previous studies [5][6][7][8] compared different resin adhesive systems, yet, none of them included a comparison with glass-ionomer adhesives, especially under stresses of ultrasonic scaling. Thus, the current study aimed to evaluate the effect of ultrasonic scaling, in presence of different adhesive systems, on microleakage of class V composite restorations.…”